Year	Percent
1996-01-01	54.278400000000000
1997-01-01	46.836000000000006
1998-01-01	24.701500000000000
1999-01-01	24.529000000000000
2000-01-01	44.484400000000000
2001-01-01	51.454100000000000
2002-01-01	50.326300000000000
2003-01-01	53.842100000000000
2004-01-01	56.993800000000000
2005-01-01	45.705600000000000
2006-01-01	48.406600000000000
2007-01-01	57.520100000000000
2008-01-01	47.746700000000000
2009-01-01	54.511600000000000
2010-01-01	51.698100000000000
2011-01-01	67.282000000000000
2012-01-01	65.671800000000000
2013-01-01	63.790200000000000
2014-01-01	60.018000000000000